VINE: NOTES ON FOSSIL POLYZOA. 
387 
form and the Scotch specimens. In Vincularia Binniei, Eth. Jun.,* 
there is a slight resemblance between the two fossils, but I have no 
evidence of " hexagonal cells " in my specimen. 
I have been careful in drawing up the characters of Heterotrypa 
delicatula, for the simple reason that very little is known of the 
Yorkshire fossils described by me in this and other papers ; and for 
this reason I wish to direct the attention of Yorkshire Palasontologists 
to the species described and figured in this paper especially. 
Sub-Genus Diplotrtpa, Nicholson. 
Pal. Tabulate Corals, p. 312 — Genus Monticulpora, p. 155. 
= Stenopora and Chcetetes of authors. 
Corallum discoid, globose, sometimes leaf -like, with a thin 
basal epitheca." — Monticulipora, p. 155. 
3. DiPLOTRYPA sp. var. PETROPOLITANAFOEMA (n. var. ?) pi. XXI., 
fig. 2, a, b. 
Corallum encrusting crinoid stem, with, so far as superficial 
examination afford me evidence, thin and structureless walls. Coral- 
lites of two kinds, small and large, generally hexagonal in shape. 
Spiniform corallites often present in the angles, and occasionally very 
conspicuous. Monticules well-marked, indicated by larger calicular 
openings. 
Locality : Hurst, North Yorkshire. 
I cannot say whether the present is a very abundant variety, 
for I have only a single specimen, and from this the above diagnosis 
is drawn up. If a comparison is instituted, it will be seen that the 
small portion of surface figured closely resemble Diplotrypa petro- 
politana Pander (Monticulipora, p. 159), but that is a free form with 
a basal epitheca ; the present is encrusting-, and besides, spiniform 
corallites " are developed ; in D. petropolitana there are no " spiniform 
corallites." I am also unable to say whether this is the Calamopora 
incrustans of Phill, (Geo. of Yorkshire). 
4. Ceeamopora megastoma, ? M'Coy. 
(PL 2, fig. 3). 
See Notes on Carboaiferous Polyzoa, Vine, Jour. Geo. & Polytec. Soc, Yorkshire, 
1882, p. 330. 
* Geological Magazine, April, 187G. 
